Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

What type of welding process should be avoided on a pressure vessel?

What type of welding process should be avoided on a pressure vessel?

What type of welding process should be avoided on a pressure vessel?

I am learning about welding on pressure vessel manufacturing. Is there any preferred method for long seams vs circ seams? Any specific welding process that should be avoided and why?
Thanks much.

RE: What type of welding process should be avoided on a pressure vessel?

Pressure vessels are a vast and diverse field spanning from tiddly-wink instrument air receivers to cryogenic propellant tanks and beyond. There is no one size fits all approach since technical requirements are vastly different for each application.

Zeroth law, it must meet customer technical requirements and the code. Dont use FCAW when ultra pure TIG is required for sanitary systems. First, it should be done with all the proper procedure and personnel qualifications. Second, it should be economical. Don't specify electron beam welding when your competitor is using MIG for the same tank. Don't stick weld when your competitor is using SAW. Etc etc

Not making a decision is a decision in itself

RE: What type of welding process should be avoided on a pressure vessel?

Assuming we're talking about ASME vessels in Section VIII, and welding to Section IX.

The weld process is part of the Weld Procedure Specification (WPS), which defines the values of your essential variables and does not allow them to change.

You can only use qualified (meaning demonstrated to the code's requirements) processes on code work, welded by qualified welders. So your limitations exist within the capabilities of your resources - welders and engineers.

If you can write a WPS, demonstrate its suitability, and qualify your welders/equipment as capable of meeting the WPS - you can pretty much use any method or material as you see fit. You will need to justify anything too abnormal, but the rule of thumb is that everything is permitted unless specifically mentioned in the code. They're not telling you HOW to build your vessel, they're telling you how to make sure you're doing so safely with the correct analysis and quality control required of what is a safety issue.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close